This type of puzzle game is right up my alley. I really loved the puzzles.
My only issue is that the controls seem a little unintuitive. I think, instead of pressing UP to walk forward, you could just have the arrow keys move you in their respective directions regardless of your "facing" direction? Or maybe get rid of arrow keys altogether and just make WASD move and "aim"?
It's a small issue, I'm sure I could get used to the controls, but fumbling with them early on was a little frustrating.
Anyway, I really enjoyed solving the puzzles, there is a lot of potential to expand on here. Great job!